The trouble is he won't (hasn't) had anything like a normal childhood and, no doubt, will find fitting into social groups, including marriage, family and work, difficult if not impossible.
My last partner was a classical musician of some note and her childhood consisted of little more than practising instrument X - it stuffed up her life.
Childhood genius is not all it's made out to be.
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"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland
Education is about more than just academic study. Life's experiences are a great teacher. How much life experience has a 9 year old got? Our daughter and son in-law are both teachers. Have done nothing else. Take them out of their education world and their knowledge base plummets.
I agree with the fact that he will unfortunately lack some of lifes skills including social interaction.
bgt has put a good point out there that many of our school teachers that are tasked with the education of our grandchildren, have actually never left school. Probably not the most healthiest of situations with impressionable youngsters.
So by the simple fact that a 9 yo has been able to earn a uni degree he has no life skills, will not mature as a functioning adult, will lack life skills and not be able to interact socially.
Wow guys you are able to discern so much from a little info.
Why don't you look on the bright side and give the kid a chance first?